Hi Heribert,
DVB modules for BV7-32 MK1,2&3 are diffrent from modules for BV7-40, DVB Modules for BV7-40 MK1&2 are diffrent from Modules for BV7-40 MK3,4&5.
You can allways check what modules were/are avaiable still for older products on the Bang&Olufsen Product Archive site!(Google It) with their respective model numbers.
For e.g a BV7-40 MK2 had its own DVB-S or DVB-T module but can now be upgraded to take the newest DVB-HD module.
Regards Douglas
p.s I hope this is a bit clearer